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Image forming apparatus including paper dust collecting and optical detection

a technology of optical detection and forming apparatus, which is applied in the field of image forming apparatus, can solve problems such as the deterioration of the detection accuracy of optical sensors, and achieve the effect of suppressing the deterioration of the detection accuracy

Active Publication Date: 2019-04-30
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent aims to prevent the detection accuracy of an optical detection unit in an image forming apparatus from declining due to paper dust.

Problems solved by technology

This may result in deterioration in the detection accuracy of the optical sensor.

Method used

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  • Image forming apparatus including paper dust collecting and optical detection
  • Image forming apparatus including paper dust collecting and optical detection
  • Image forming apparatus including paper dust collecting and optical detection

Examples

Experimental program
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Embodiment Construction

[0017]Exemplary embodiments of the present disclosure will be described below with reference to the drawings.

[0018]A first exemplary embodiment illustrates a laser beam printer 100 (hereinafter referred to as the printer 100) of an electrophotographic system as an example of an image forming apparatus. FIG. 1 illustrates the configuration of the printer 100.

[0019]The printer 100 includes a sheet feeding cassette 15, photosensitive drums 1, charging rollers 2, laser scanners 11, developing devices 8, and primary transfer rollers 4, which correspond to stations for four colors of yellow (Y), magenta (M), cyan (C), and black (Bk), respectively. The printer 100 also includes an intermediate transfer belt 24, a drive roller 23 that drives the intermediate transfer belt 24, a stretching roller 13, a secondary transfer roller 25, a secondary-transfer opposing roller 26, a fixing device 21, and a control unit 10 (central processing unit (CPU)), which may include one or more processors and o...

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PUM

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Abstract

An image forming apparatus includes a paper dust collecting unit which collects, by application of a voltage, paper dust attached to a sheet, an optical detection unit provided on a downstream side of the paper dust collecting unit in a sheet conveyance direction, which irradiates the sheet with light and receives light via the sheet, a guide member which comes into contact with the sheet to be conveyed to guide the sheet, at least one of light directed toward the sheet from the optical detection unit and light directed toward the optical detection unit from the sheet passing through the guide member, and a control unit which switches a polarity of the voltage to be applied to the paper dust collecting unit and causes the sheet charged through the paper dust collecting unit to be conveyed to the guide member.

Description

BACKGROUNDField of the Disclosure[0001]The present disclosure generally relates to image forming and, more particularly, to an image forming apparatus including a paper dust collecting unit that collects paper dust attached to a sheet, and an optical detection unit that irradiates the sheet with light and receives light via the sheet.Description of the Related Art[0002]It has heretofore been known that some image forming apparatuses, such as a copier and a printer, are provided with a paper dust collecting roller to collect paper dust attached to a sheet. In an image forming apparatus discussed in Japanese Patent Application Laid-Open No. 2010-222107, a paper dust collecting roller is charged to be brought into contact with a sheet, thereby collecting paper dust attached to the sheet.[0003]In addition, Japanese Patent Application Laid-Open No. 2014-114131 discusses an image forming apparatus including an optical sensor that captures an image of a surface of a sheet by irradiating th...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G03G15/00G03G21/00
CPCG03G15/5004G03G15/6558G03G15/5029G03G2221/0042
Inventor KOYAMA, SHOICHI
Owner CANON KK